Work support for riveting machines



March 30, 1937. A, R, HAVENER 2,075,113 v WORK SUPPORT FOR RIVETINGMACHINES Filed Nov. 20, 1954 2 Sheets-Sheet 1 /7 22 I f r .1 p 66'\ 5 m;:2: g l I I 33 /f Cum, I lHam-w 1 I I WW Patented Mar. 30, 1937 UNITEDSTATES PATENT OFFICE WORK SUPPORT FOR, RIVETING MACHINES settsApplication November 20, 1934, Serial No. 753,854

13 Claims.

This invention relates to a work support which, although designed withspecial reference to use in riveting machines of the type shown anddescribed in an application for United States Letters Patent forriveting machines filed by me November 20, 1934, Serial Number 753,853,is adapted for use in various other machines of that general class.

Generally in the use of riveting machines, it is customary for theoperator to position the Work by hand in proper position on a fixed worksupport and then to start the machine in operation to set the rivets 'bypressure on a foot treadle. When the work is of small size, however,there is great danger of injury to the hands of the operator through apremature starting of the machine or in the operation of the machinebecause of the proximity of the hands to the rivet driving tool. Toavoid injury requires careful positioning and handling of the work whichhas the effect of slowing down the speed of operation and the amount ofwork turned out, thereby increasing the cost of production.

One of the important objects of the invention is the provision of a worksupport for riveting and similar machines which is normally in aninoperative position for receiving and positioning the work and which isadapted to be moved into an operative position before the machine isstarted,

thereby eliminating all danger of injury to the operators hands.

Another object of the invention is the provision of means whereby thedepression of the foot treadle usually employed to start the machinefirst moves the work support from its normal position to an operativeposition before it functions to start the machine.

A further object of this invention is the provision of a work support ofthe above character adapted for horizontal reciprocation from aninoperative to an operative position, and vice versa.

Other objects of the invention will be in part obvious and in part moreparticularly described hereinafter.

In the accompanying drawings illustrating one embodiment of myinvention, Figure 1 is a left side elevation of a riveting machinehaving a work support constructed and adapted to be operated inaccordance with my invention;

Fig. 2 is an elevation looking from left to right in Fig. 1 on anenlarged scale of the clutch mechanism of the machine;

Fig, 3 is a side elevation of the work support; and

Fig. 4 is a front elevation of the same.

In the drawings, there is shown only such parts of the riveting machineof my copending application hereinbeiore referred to as are necessaryfor an understanding of the invention of this application and referencemay be made to said application for a description of the parts of saidmachine not herein shown.

Referring to Figure 1 of the drawings, l2 indicates the frame of themachine mounted on a base I3 and having an upper overhanging arm It. Arivet driver I5 is mounted in the lower end of a slide l6, rectangularin cross section, which is reciprocated in suitable ways in the arm M bya lever ll pivotally connected at one end to the upper end of the slide.The lever l! is pivoted on a pin l8 in an arm l9 pivotally mounted atits lower end on a pin 20 set in the frame I2; The rear end of the leverI1 is pivotally connected by a pin 2| to a member 22, which at its lowerend is mounted upon a crank 23 of a shaft 24 rotatably mounted in theframe. The member 22 is made up of two parts having a screw-threadedengagement with each other permitting the length of said member to beincreased or decreased at will.

On the extended base l3 of the frame is mounted a motor 30 having ashaft 3| provided with a worm gear 32 which meshes with a gear 33 fixedto a shaft 34 rotatably mounted in the frame l2. A pinion 35, alsofastened to the shaft 34, meshes with an idler gear 36 adapted for freerotation on the shaft 24 which constitutes the driving member of a twopart clutch for rotating said shaft, the other or driven member 31 ofsaid clutch being fastened to the shaft 24.

The driving member 36 is recessed on one side and provided with aplurality of pins spaced at intervals around said recess, and the drivenmember 31, projecting into said recess, carries a pivotally mounted dogwhich is held by a spring-actuated pin in position for engaging one ofsaid first-mentioned pins for locking the two parts of the clutchtogether in order to rotate the shaft 24. These parts are shown indetail in my companion application hereinbefore referred to, to whichreference may be made for a more complete description.

The gear or driving member 36 is unlocked from the driven member 31 ofthe clutch by the slide 45 which is caused to engage the outer end '46of the dog and move the same out of engagement with one of the pinscarried by the driving member, which permits the driving member torotate freely, While the driven member of tened, remain stationary.

The slide 45 is mountedfor reciprocation in a suitable way formed in theframe of the ma-' chine and is provided with an outwardly projectingarmA'I. A spring 48, constantly under tension, is attached at one end tosaid arm and at the other end to a' pin 50 in said frame, which springholds the slide in operative position for engaging the end of the dog todisconnect the two parts of the clutch (Figs. 1 and 2).

For withdrawing the slide from engagement with the end of the dog 4I..topermit the springactuated pin t3 to force the dog into engagement with apin 40 to lock the two parts of the clutch together to start themachine. suitable means,

, adapted to be operated by a foot treadle, is provided (Fig. 2). Alever 52 is pivotally mounted at its lower end upon a pin 53 set in theframe,

and fastened to the lever is a short lateral arm 54 operativelyconnected to a foot treadle by means hereinafter described. Pivotal'lymounted on a pin in-the upper end of the lever 52 is a pawl 56 which isheld in position for engaging the arm 41 on the slide by a spring 51under tension connectedat one end to a pin 58 set in tail of the pawlstrikes a screw 60 threaded in a. projecting lug 6I on the frame whenthe further movement of the lever causes the nose of the pawl todisengage from the arm on the slide, permitting the spring48 to returnthe slide instantly to operative position for disconnecting the twoparts of the clutch at the end of one i complete revolution. 'The screw61 maybe held in adjusted position. by aset nut 62.

. Fastened to; the front face of the frame in alignment with said upperarm is a lowerarm I to which is secured a plate I22 projecting beyondthe end of the arm. Fastened to this plate is a top plate I23, providedwith a longitudinal recess I24 in its top face having dovetailed sides,-

in which recess is slidably fitted the base I26 of a work support I21carrying an anvil I28, having mounted therein 'a spring-pressedretractable pilot I30 for centering tubular rivets mounted thereon.

For moving the work support I2I inwardly from a normally inoperative toan operative position in which the anvil is in alignment with thedriver, any suitable means adapted to be operated by a foot treadle maybe provided.

One form of this means comprises a bell-crank lever. I32 pivotallymounted on a pin I33 in the lower end of a dependin'g plate bracketl34'fastened at its upper end to the lower arm I20 and plate I22. Theupper arm of said bell-crank .lever- I32 is pivotally connected by a pinI35 to one end of a link I36, the other end of which is pivotallyconnected by a pin I3I to a lever I38, which, in turn; is pivotallymounted at its lower end on a pin I39 in the bracket I34. The upper end-0f the lever I38 is pivotally connected by a pin I40 to a short linkI4I, having itsother end likewise connected by a pin I42 to a bifurcatedlug I43 on the work support.

The lower arm of the bell-crank lever I32 is pivotally connected by apin I45 to an elongated plate link I4'I having a longitudinal slot I48in its lower end. Connected to the link I4'I by a block I50 and rod I5Iis a foot treadle I52 pivotally mounted on a bracket I53 and normallyheld in raised position by a spring I5'I. The block I50 is bored toreceive the rod I5I and is adjustably fastened thereto adjacent itsupper end by a screw I54. In one end of the block is a pin I55 whichprojects through the slot I48 in the link I41 and is held thereinloosely to permit the pin to slide in said slot by a washer I56. Aspring I58under tension. connected at its upper end to the pin I45 andat its lower end to thepin I55, tends to hold the pin in engagement withthe upper end of the slot I5I.

'The block I50 is also bored to receive loosely the hooked into arm 54,for operating the clutch to start the machine. Fastened to the rod I60by a screw i6I is a collar I62 adapted to be engaged by the block I50for starting the machine after the preliminary movement of the treadlehas moved the work support into normal operative position. By adjustingthe distance between the block and collar, thev time of startingthemachine in relation to the moving of the work sup-' port can beclosely regulated. An adjustable screw stop I64 threaded into the rearface of the work supportis adapted to engage an upwardly projecting lugI65 on the topplate I23 for limiting the rearward movement of the worksupport to secure alignment between it and the rivet driver. The rod I60is normally held in a raised position by a spring I6'I fastened at oneend to a hook I68 set in the bottom of the base I3 and.

having its other end hooked around a pin I69 carried by the rod I60. 7

The rivets used in the machine are of the wellknown tubular type and arefed to a rivet holder I10 from a hopper through a raceway "2, whichparts are of construction well-known to those skilled in the art.

In the operation of the machine, a rivet is fed into the holderinposition to be engaged by the driver on its downward stroke.

the operatonas shown in Figure 1, in which position the operator placesthe previously punched work upon the anvil, centering itsby, means ofthe spindle or pilot I30 inthe punched hole. After the work has beenproperly positioned, the

' treadle is depressed, which pulls down the lower arm of the bell-cranklever I32 and through the Normally, the r work support is in aninoperative position toward instrumentality of the link I36, the leverI38 and the link I4I, moves the work support rearwardly The until thestop I64 engages the lug I65. spring I58 is of suflicient strength toresist this movement and to hold the pin I55 in the upper end of theslot I48 in the link I41. When further rearward movement of the worksupport is pre vented by the stop I64, the block I50 is then pulled,downwardly by the rod I5I against the tension of the spring I 58 untilit engages the collar I62, after which the continued depression of thetreadle pulls the rod I60 downwardly to w referred to, and therebythepin I55 in the block 15!! engages the upper end of the slot in thelink 141, pushes the link upwardly and operates the bell-crank lever tothrow the work support into its normal inoperative position.

The clutch used in a machine of this type is a one-revolution clutch andthe machine stops at the end of one revolution irrespective oftheposition of the rod I60 and it cannot again be started until thepressure of the treadle is released.

My invention entirely prevents-injury to the operators hands whilepositioning the work, which instills a sense of security and tends tospeed up the work. l

It is to be understood that the invention is not to be limited toriveting machines,-since it is capable of use in other machines of thatgeneral class and that it is notto be limited to the specificconstruction shown, since it may be embodied in other forms ofconstruction within the purview of the following claims.

What I claim is: I

1. In a machine of the class described, the

, combination of a work support mounted for horizontal reciprocation andnormally in an inoperative position, a pivotally mounted bell-cranklever operatively connected at one end to said work support, a foottreadle, a treadle rod, resilient connections between said treadle rodand the other end of said lever whereby a partial depression of saidtreadle moves said work support into operative position and meanscarried by said treadle rod whereby a furtherdepression of said treadlestarts the machine in operation.

2. In a machine of the class described, the combination of a worksupport-mounted for horizontal reciprocation, means for holding saidwork support normally in an inoperative position, a pivotally mountedbell-crank lever operatively connected at one end to said work support,a foot treadle, a treadle rod, resilient connections bebetween saidtreadle rod and the other end of said lever whereby a partial depressionof said treadle moves said work support into operative position, meansfor starting the machine in operation and means carried by said treadlerod whereby a further depression of said treadle operates said startingmeans to start the machine in operation.

3. In a machine of the class described, the combination of a worksupport mounted for horizontal reciprocation, a pivotally mounted bellcrank lever operatively connected at one end to said work support, afoot treadle, resilient connections between said foot treadle and thesaid other end of said lever including a treadle rod and a spring, saidspring being of suffibient strength without distension to move said worksupport to operative position when said treadle is partially depressedand being distensible to permit further depression of said treadle aftersaid work support has reached operative position, means for starting themachine in operation, means carried by said treadle rod for operatingsaid starting means on the further depression of said treadle and meansfor returning said work support to inoperative position when thepressure on said treadle is released.

4. In a machine of the class described, a work support mounted forhorizontal reciprocation, a pivotally mounted bell-crank lever connectedat one end to said support, a foot treadle provided with a treadle rod,a spring connecting said rod and the other end of said bell-crank leverand adapted to move said work support into opera tive position when saidtreadle is partially depressed, means for starting the machine inoperation, means carried by said treadle rod for operating said startingmeans on a further depression of said treadlerod after the work supporthas been moved into operative position, and a spring for raising saidtreadle when the pressure thereon is released to return said worksupport to inoperative position.

5. In a machine of the class described, a work support mounted forhorizontal reciprocation, a pivotally mounted bell-crank lever connectedat one end to said support, a spring for holding said work supportnormally in an inoperative position for receiving work, a slotted linkpivotally connected to the other end of said lever, a foot treadleprovided with a treadlerod; a block member secured on said rod andhaving a pin projecting through the slot in said link and a springfastened at one end to the end of said pin and at its other end to saidlever, said spring being of sufiicient strength without distension tomove said work support to operative position on a partial depression ofsaid treadle.

6. In a machine of the class described, a worksupport mounted forhorizontal reciprocation, a pivotally mounted lever connected at one endto said support, a spring for holding said work support normally in aninoperative position for receiving work, a slotted link pivotallyconnected to the other end of said lever, a foot treadle provided with atreadle rod, a block member secured on said rod and having a pinprojecting through the slot in said link, a spring fastened at one endto the end of said pin and at its other end to said lever and means"actuated by said block member on the depression of said treadle forstarting the machine afterthe work support has been moved into operativeposition.

7. In a machine of the class described, a work support mounted forhorizontal reciprocation, a pivotally mounted bell crank lever connectedat one end to said support, a spring for holding said work supportnormally in an inoperative position for receiving work, a foot treadle,a treadle rod, a block member fastened on said treadle rod, a springintermediate said block and said lever and means actuated by said blockon the depression of said treadle for starting the machine after thework support has been moved into operative position.

8. In a machine of the class described, the combination of a worksupport mounted for horizontal reciprocation, a spring for holding saidwork support normally in an inoperative position, a bell-crank leverpivotally mounted at its angle,

one end of said lever being operatively connected to said work supportfor reciprocating the same when said lever is turned on its pivot, afoot treadle, a treadle rod, a spring connecting the upper end of saidtreadle rod with the other end of said bell-crank lever, said springbeing of sufficient strength on a preliminary depression of said treadleto move without distension said work support from normal inoperativeposition to operative position, a depending rod adapted when pulled downto start the machine in operation and means carried by said treadle rodfor pulling down said starting rod to start the machine on a furtherdepression of said treadle.

9. In a machine of the class described, the combination of a worksupport mounted for horizontal reciprocation, a spring for holding saidwork support normally in an inoperative position, a bell-crank leverpivotally mounted at its angle, one end of said lever being operativelyconnected to said work support for reciprocating the same when saidlever is turned on its pivot, a foot treadle, a treadle rod, a springconnecting the upper end of saidtreadle rod with the other end ofsaid'bell-crank lever, said spring being of sufficient strength on apreliminary depression of said treadle to move said work support fromnormal inoperative position to operative position, a depending rodadapted when pulled down to start the machine'in operation and means,comprising a block carried by said treadle rod and a collar fastened'inadjustable position on saiddepending rod for pulling down said startingrod to start the machine on a further depression of said treadle. V

10. In a machine ofthe. class described, the

combination of a work support mounted for a slotted link for guiding theconnection of said spring to said rod, a depending rod adapted whenpulled down to start the machine in operation and means, comprising ablock carried by said treadle rod and a collar fastened in adjustableposition on said depending rod, for pulling down said starting rod tostart the machine on a further depression of said treadle.

11. In a machine of the class described, the

. combination of a work support mounted for horizontalreciprocatiomresflient means for holding said work support normally inan inoperative position, a bell-crank lever operatively connected at[one end to said work support, a foottreadle, a

12. In a machine of the class described, the combination of a worksupport mounted for'horizontal reciprocatiomresilient means for holdingsaid work support normally ,ini-an, inoperative position, abell-cranklever operatively connected at one end to said work-support,afoot treadle, a treadle rod, a springconnecting said treadle rod to theother end of said lever whereby apartial depression of said treadlemoves said work support into operative position without distending saidspring, and means carried by said treadle rod whereby a furtherdepression offsai'd'trfeadle starts the machine in operation;

13. In a machine of the class described, the

combination of a work support-mountedifor horizontal reciprocation,resilient means for holding said work support normally in an'inoperativepo sition, a bell-crank lever operatively connected at ther'depressionof said treadle operates said rod to start the machine in operation,

ARTHUR: R. HAVENER',

